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physical object > person > dead person > 19th century scientist > Hertzsprung
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Hertzsprung comparison table
Subject has domain is a kind of is an instance of has definition
19th century scientist dead person a scientist born between 1800 and 1900 AD
astronomerastronomyscientist a scientist specializing in astronomy
Hertzsprungastronomy 19th century scientist 

Next 19th century scientist: Hubble    Up: 19th century scientist, astronomer    Previous 19th century scientist: Hale